Reenforcement for shovel handles



.. E. WEBSTER.

REENFORCEMENT FOR sHovEL HANDLES.

APPLICATION FILED AUG511920. 1,41,043, Patented Mar. 21, 1922.

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LEWIS E. WEBSTER, OF WYOMING, PENNSYLVANIA.

REENFORCEMENT FOR SHOVEL HANDLES.

Specification of Letters Patent.

Patented Mar. 21, 1922.

Application led August 6, 1920. Serial No. l101,795.

T 0 all whom t may concern Be it known that I, LEWIS E. WEBSTER, acitizen of the United States of America, residing at Wyomin in thecounty of Luzerne and State of ennsylvaniayhave invented certain new anduseful Improvements in Reenforcements for Shovel Han dles, of which the'following is a full, clear, and exact description.

In the manufacture of shovels and like tools where the so-called Dhandles are employed it has been found desirable to insert reenforcinglscrews in the grip portion of the' D handle. The purpose of these screwshasbeen to reenforce and strengthen the D handle, allow for anadjustment and take up, should shrinkage or a split occur. The screws orbolts heretofore used for this purpose have not been found entirelysatisfactory as they tend to back out of place and it has been founddiflicult to properly place thevsame in the handle grip.

The present invention has forits objectsA the provision of a slotlessscrew device of novel form which is particularly adapted for thereenforcing of shovel andv other tool handles.

A further object of the invention resides in the provision of a slotlessscrew which is adapted for uniting planks or blocks together in such amanner that a stronger joint may be secured between the planks or bloksthan with the fastenings heretofore use Other objects and advantagesreside in the'provision of a screw which is cheap and economical tomanufacture. Y

Other objects and advantages will be further pointed out in theaccompanying speciication and shown on the drawings in which:

F ig. 1 is a view of a shovel handle reenforced with my novel slotlessscrew. y

Fig. 2 is a diagrammatic view which shows the manner in which theslotless screws rotate as they enter the wood and illustrates'the mannerin which one screw portion closes the slotin the wood forced by thepreceding screw portion.

Fig. 3 shows a pair of planks joined together with my novel fasteningmeans.

Fig. 4 shows detail top and side views of the slotless screws.

Referring to Fig. 4, the screws comprise a cylindrical stem 11, hereshown as rounded. Upset from the metal of-the cylindrical stemf areswedged screw-threaded portions 12, 13 and 14 and a second group ofthreaded portions marked 12"13b and 14h. The angle of lead of eachthreaded portion is such that the spirals do not align with each other.In the present embodiment I have found it preferable to. displace thespirals of threaded portions 12, 13 and 14, 120 from each other.Threaded'portions 12a, 13b and 14h are so arranged that the developedspirals are likewise displaced 120 relatively to each other and are alsodisplaced 180o relatively to the corresponding spirals ofthreadedportions 12, 13 and 14. This relative displacement of thedisplaced spirals produces certain desirable results to be hereafter setforth.

In applying the vslotless screws to -reenforce a shovel handle I drillin from the sides of the handle parallel holes l5 of such diameter as tosnugly -receive the shank portions of the slotless screws. tend-entirely through and have a length in excess of the length of theslotless screws as shown at 16 in 'Fig 1. Preferably the ends of theholes are countersunk to provide a recess for the heads of the screws.

After drilling the slotless screws are'inserted from opposite sides anddriven into place by a hammer, arbor press or other The holes do notexgrip and fiat portions of the tool. The driving action causes thethreaded portions to enter the wood and thereafter a spiral rotation isimparted to the screw as the same is advanced. The various individualand separated thread portions all enter the wood at different places andthe effect of this entry is to close up the spiral slot in the wood madeby the preceding threaded portion so that finally the slotless screwsare'in effect molded inthe wood. F urther "tion andy prevents theloosening of the screws.

Should the handle shrink enough to allow the slotless screws toprotrude, the latter may be hammered in further by reason of theextended drill opening 16, and they will thereafterbe securely held inposition.

' call sur being'A axially dis laced with respect'to the If it isdesired to use the slotless screws for securing planks together they areapplied ina similarmanner as shownin Fig. 3. After the screws have beenonce driven home it will be found that their withdrawal is quite diicultinasmuch as the threaded portions would have to-'revolve backwardthrough thesame channels which they cut while entering. The fasteningthus secured is stronger than the ordinary spike fastenin used withplanking. l at I claim as my invention is: l. A screw comprising incombination, a

shank, and a plurality of thread-forming helical projections upon saidshank, the'heliaces of certain of said, projections hlical surfaces othe other projections.

different angular 2.y A slotless screw comprising a shankportion vand aplurality of independent developed spiral surfaces, whereby the saidthread portions successively enter'the wood at different points when thescrew is driven into position.

3. A slotless screw comprising' a shank portion and a Vplurality ofupset swaged portions, said' thread portions being4 disposed onebehindrthe other from the end of the screw-and being adapted to enterthe wood at different points and follow independentv spiral paths whenthe same are driven into position. l y

4. A slotless screw comprising a .shank having upset therefrom4 aplurality of.

groups of thread portions, the said thread portions of, each grouphaving a-lead of such amount that the threads enter the wood at Ipoints. g

In .testimony w ereoil I hereto affix my signature., 1

LEWIS WEBSTER. i

thread portions disposed upon independent y

